boards/{nrf53|stm32h7}: mark shmem region as NOLOAD

Shmem region lives in RAM and should not be load in FLASH.

This fixes the issue with wrong binary size when build AMP
configurations with RPTUN enabled. Before this change shmem
region was exported by objcopy to binary file which caused
the bin size to be huge and impossible to flash.

Signed-off-by: raiden00pl <raiden00@railab.me>

boards/arm/nrf53/common/scripts/flash_app.ld

@@ -126,7 +126,7 @@ SECTIONS
 
     /* Shmem */
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/nrf53/nrf5340-audio-dk/scripts/flash_app.ld

@@ -103,7 +103,7 @@ SECTIONS
 
     /* Shmem */
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/nrf53/nrf5340-dk/scripts/flash_app.ld

@@ -103,7 +103,7 @@ SECTIONS
 
     /* Shmem */
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/nrf53/thingy53/scripts/flash_app.ld

@@ -103,7 +103,7 @@ SECTIONS
 
     /* Shmem */
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/stm32h7/nucleo-h745zi/scripts/flash.ld

@@ -117,7 +117,7 @@ SECTIONS
         _ebss = ABSOLUTE(.);
     } > sram
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/stm32h7/portenta-h7/scripts/flash.ld

@@ -123,7 +123,7 @@ SECTIONS
         _ebss = ABSOLUTE(.);
     } > sram
 
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/stm32h7/stm32h745i-disco/scripts/flash.ld

@@ -193,7 +193,7 @@ SECTIONS
     } > sram
 
 #ifdef CONFIG_STM32H7_CORTEXM4_ENABLED
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);

boards/arm/stm32h7/stm32h750b-dk/scripts/flash.ld

@@ -192,7 +192,7 @@ SECTIONS
     } > sram
 
 #ifdef CONFIG_STM32H7_CORTEXM4_ENABLED
-    .shmem :
+    .shmem (NOLOAD):
     {
         . = ALIGN(4);
         *(.shmem);